Today a friend of mine asked me a question “Will a plane, supposing that it was fixed above the Earth, fall down on the same point where it firstly took off from?!”
And when I thought about it that what I’ve reached:
The moon, has a fixed orbit around the Earth, why? Because of the gravity on Earth!
Suppose that the moon was on Earth and it was fired from it, so I think that the place where the moon is now is the same place where it was fired from due to the gravitational and centrifugal force between the Earth and the moon.
Well that was only a try to solve the problem if you have any other solution kindly leave it in a comment J